I just downloaded version 4.7 of iTunes for the iPOD. One of the coolest features is that offers an EQ so you can pick the sound effect you want to hear depending on the genre of music. These include: Acoustic, Bass Booster, Bass Reducer, Classical, Dance, Electronic, Flat, Hip Hop, Jazz, Latin, Loudness, Lounge, Piano, R & B, Rock, Small Speakers, Spoken Word, Trebel Booster, and Vocal Booster.
My 20 GB model is half way full with almost 3,000 various songs. I have had my unit for almost one year and really enjoy using it, especially with my Bose QuiteComfort headphones.
You should check the iTunes site regularly for free updates and downloads. This platform keeps getting betting and better.